When stitched magearm with tome of faded soul destroy group of champion with magic beam, none stitched remain produced, when stitched seamstress destroy group of champion with charged aoe attack, only one produce stitched remain
AoE attacks are coded like a targeted attack with subrange for area. I will guess Deconstruct only checks for the "targeted" unit dying, so the unit below your click will only be affected. Bug to me.
Confirmed for Magic Beam. Unable to reproduce for the others. Note: This kind of stuff is unrelated to the client. Game code is game code, client is just interface.
Use stiched shaman equipped with yetihide cape and frost cone a group of friendly crystalis, only 1 produce stiched remain, use stiched magearm equipped with tome of fade soul, magical aura surrounding friendly crystalis, only one produce stiched remain